A
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
1
4/2001
Model 829R Linesensor
Description
The Model 829R Linesensor is designed specifically for
monitoring the AC line voltage. It is used as a window
comparator; if the line voltage rises above the high set point
or drops below the low set point, the output is switched. With
the Model 829R, a heavy-duty relay is activated when the
input is inside the window determined by the Hl and LO set
pots.
The relay output can drive logic circuits, lamps, relays, or
other controls, and is fully isolated from the AC line voltage
being monitored.
The Model 829R relay contacts are rated for resistive loads of
1 Amp at 26 VDC or 0.5 Amp at 115 VAC.
Connections are easily made via barrier strip connections and
the module is epoxy-potted for ruggedness.
Features
Self-Contained and Safe
!
Operates from AC line voltage
!
Fully isolated
!
Fail-safe logic
Easy to Use
!
Barrier-strip connections
!
Mounting bolts provided with each unit
Fast Response
!
100 ms average
!
20 ms on drop-out
SPDT Relay Output
Applications
Medical Instruments
Protects against potentially dangerous analytical data errors
due to excessive line voltage variations.
Computers
Protects memory by signalling line drop out in just over one
cycle and protects computer circuits from damaging high line
voltages.
Instruments
Protects expensive instruments against high voltage damage
due to sustained line transients.
Auxiliary Power
Senses line power loss and starts auxiliary generator. Acts as
an over-under alarm for generator output voltage.
Motors
Protects against motor burn up due to excessive current draw
from low line voltage conditions.
Model 829R Block Diagram
A
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
2
4/2001
Model 829R Linesensor
Specifications
(1 ) The AC line voltage must maintain an average value
within the window set by the HI set and LO set
potentiometers. This protects against brownout and
continuous overvoltage conditions.
(2) The AC line voltage must be present for at least 16
milliseconds (one cycle at 60 Hz) out of each cycle. If the
AC line voltage suddenly drops out then the Model 829
will sense this sudden drop even though the average is
still above the LO setpoint. This provides rapid response
in the event of complete power failure.
These two conditions assure fail-safe operation.
Mechanical Specifications
Response Time
Response time with 2% overdrive is a maximum of 100
milliseconds due to the average filter. A small amount of
hysteresis, approximately 1%, is used to prevent false triggering
on the ripple voltage. A separate circuit path bypasses the
averaging filter and peak-detects the line voltage during each
cycle. If the AC line voltage suddenly drops, then the "drop-
out" circuit takes control and will switch the output state within
a maximum of 20 milliseconds (25ms for 50 Hz).
Operation
The operation is shown below in diagram form. For the relay
to be energized (N.O. contacts closed to arm of relay), two
conditions must be met:
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